Hydraulic feed for machine tool heads



Feb. 23, 1932. GA E. HALLENBECK HYDRAULIC FEED FOR MACHlNE TOOL HEADSOriginal Filed June 215, 1926 3 Sheets-Sheet ffii...

INvEN-r lll" 5ml:

:Ely A T'TDRNEY Feb. 23, 1932. G. E. HALLENBECK HYDRULIC FEED'FORMACHINE: TOOL HEADS s sheets-sheet y2 Original Filed June 23, 1926INQVENTG Feb. 23, 1932. G E HALLENBECK 1,846,391

HYDRAULIC FEED FOR MACHINE TOOL HEADS Original Filed June 25, 1926 3Sheets-Sheet 3 INVENTC] :E ATTDENEU.

Patented Feb. 23, 1932 UNITED STATES PATENT OFFICE GEORGE E. HALLENBECK,OF TOLEDO, OHIO, ASSIGNOR TO BAKER BROTHERS, INC. OF TOLEDO, OHIO, ACORPORATION OF OHIO HYDRAULIC FEED FOR MACHINE TOOL HEADS Applicationled .Tune 23, 1926, Serial This invention relates to tools havingadjustable holders.

This invention has utility when incorporated in multiple tools forhydraulic cycle of feeding for machine tools.

Referring to the drawings:

Fig. 1 is a side elevation, with parts broken away, of an embodiment ofthe invention in a drill press type of multiple tool having hydraulicshift for the tool holder or head toward and fromI the work;

Fig. 2 is a section through the head showing the driving connections forthe auxiliary spindles from the main spindle, and on the line llI-II,Fig. 3;

Fig. 3 is a section on the line III-III, Fig. l;

Fig. 4 is a diagram of the speed rates on a time base in the cycle ofoperations as hydraulically operated in shifting the tools toward andfrom the work;

Fig. 5 is a view on an enlarged scale of the control valve as mounted onthe side of the column of the drill press of Fig. 1;

Fig. 6 is a section on the line VI--VI, Fig. 5;

Fig. 7 is a fragmentary section on the line 'VH-VIL Fig. l; and

8 is a section on the line VIII-VIII,

Driving belt 1 as operated may rotate pulley 2 on shaft 3 mounted inbearings 4, 5, carried by column 6 upstanding from base 7. Bearing 5 isin overhang 8 from the column 6, which column 6 is provided on the sidethereof toward the overhang 8 with a pair of parallel guides 9. The base7 extends under the overhang 8, and there is disposed thereon work table10 opposing housing 11 having slide portions 12, 13, coacting with theguides 9 of the column.

The main drive shaft 3, adjacent its bearing 5, is provided with bevelgear 14 in mesh with bevel gear 15 having spline connection i6 with mainspindle 17 mounted in bearings 18, 19, of the overhang 8 and bearings20, 21 of the housing l1. Fixed with this main spindle 17 in the housingl1 is long toothed gear 22 in mesh with gears 23, 24, in one plane, andgears 25, 26, 27, in an adjacent low- No. 118,044. Renewed :rune 15,1931.

er plane (Figs. 2, 3). These gears 23, 26, 24, 27, 25, are in an annularseries and as to charging station 28 are equally spaced 60 apart toprovide rotational driving means for auxiliary spindles 29 supportedrespectively by sleeves 30 mounted in bearings 31 of the housing l1.These sleeves 30 permit the respective auxiliary spindles 29 to rotaterelatively thereto. However these respective sleeves 30, each as keyedagainst e0 rotation relatively to bearings 31, are provided with racks32 having pinions 33 in mesh therewith. These pinions 33 are mounted onshafts 34, 35, 36, 37, 38. 'Each of these shafts carries a worm wheel 39in mesh with a worm 40. The worm 40 for the shaft 36 is fixedly mountedon actuator shaft 41 having hand wheel 42. For the parallel shafts 34,35, the worms 40 are loosely7 mounted on actuator shaft 43 having handwheel 44. This actuator shaft 43 is-aXially reciprocable to shift jawclutch member 45 into driving engagement with the worm 40 for the shaft35 or for the worm 40 for the shaft 34. Accordingly, the axial shiftingof the auxiliary spindles 29 may be effected independently for adjustingsuch toward or from the work table 10 or into or out of the housing 11.

Actuator shaft 46 has loosely mounted thereon the worms 40 coacting withthe worm wheels 39 on` the respective shafts 37, 38. By operating handwheel 47, this actuator shaft 46 may be rotated. This actuator shaft 46has fixed therewith clutch member 48 which by axial shifting of thisactuator shaft 46, may be thrown into driving engagement with either ofthe worms 40 thereon for thereby effecting the desired adjustment forthe auX- iliary spindles as connected to the shaft 37 or connected tothe shaft 38. These spindles 29 terminate in tool holders 49 in lwhich.may be mounted tools 50 of similar or different characters may hedesired in the handling of Work as to whether the operations are to besimultaneously performed on the same article or Whether each operates asa different tool on a scriesfof articles which may be shifted to thepositions for the differenti tools on the table l0 wiith the'blankposition leo .28 for clamping in and removing the articles of work insuch cycle of operations.

Hydraulic control 52 about pulley 53 on shaft 54 carried by -member 67.

circulator or pump housing 55.

Cam group 56 fixed with the housing 11- has port-ion 57 coacting withroller 58 on arm 59 of angle lever having fixed bearing 60 (Figs. 1, 5).This angle lever has, at an angle to the arm 59, arm 61 terminating indog 62. Plunger 63 operated by spring 64 normally swings this anglelever 61, 59, to hold the roller 58 toward the cam 56. As the roller 58in the descent of the housing 11 reaches cam portion 65, the angle lever59. 61, is rocked to throw the dog 62 out of seat 66 in member 67. Thismember 67 has a slide. carrying pin 68 engaged by fork arm 69 of leverhaving fixed fulcrum 70 and upwardly extending arm 71 engaged by tensionhelical spring 72 having adjustable connection 73 with plate'74 fixedwith the column 6, with which plate 74 is mounted valve 75 into whichcontrol rod 76 extends from the slide member 67. This shifting of t-hedog 62. as a detent from the seat 66, allows the spring 72 quickly tothrow the slide member 67 to bring the detent 62 into seat 77 thusshifting the valvel stem 76 and effecting shift from fast descent travelportion 77 (Fig. 4) to Slow working travel portion 78 effected by thecirculator pump controlled from this valve 75.

The roller 58 now rides upon cam portion 79 and as it reaches camportion 80, there is again rocking of this angle lever 59, 61, to shiftthe detent 62 from the seat 77 to seat 81 which is effective to reversethe direction of liquid circulation from the circulator 55 and athighspeed rate to effect travel as indicated by curve portion 82 (Fig. 4).The 'plunger 63 actuated by spring 64 holds the detent 62 in its seatrelations with the slide This reversal of the circulation travel causesthe housing 11 to ascend and cam 83 carried thereby contacts terminus 67and is thus effective to push the slide member 67 against the action ofthe spring 72 for thrusting the valve control rod 76 into 'l the housing75 cutting ofi1 circulationeHecy tlveness from the circulator 55 thusbrznglng the housing 11 to a stop as shown by currve portion 84 (Fig.4). v

Liquid flow circulation from the pump 55 as controlled by the `valve 75is effective in operating the housing 11 in this cycle descent andascent through supply of such incompressible medium by way of pipe 85having branches 86,87, to cylinders 88 mounted on the base 7 to thelower side of pistons 89 therein having piston rods 90 upwardlyextending therefrom which have adjustable connection 91 with the housing11 shown outwardly and forwardly from the guides 9 and parallel withsuch guides.

From the circulator housing 55 in addition to the pipe 85, is pipe 92having branches 93, 94, to the upper portions of the respectivecylinders 88 above the pistons 89. Accordj ingly, in the control of thecirculatory fiow in this closed liquid circuit, there may be thepositive operation of this tool carrier housing 11 in its travel rapidlyinto position adjacent the work then' at a slower'feed rate in itsworking operation, automatically followed by the quick recover clear ofthe work for a repetition of the cycle of operations.

To effect repetition of the cycle of operations, the operator depressespedal 95 mounted on fixed fulcrum 96 carried bv the base 7 Fixed withthis pedal 95 is upwardly extending arm 97 having adjustable link 98extending rearwardly therefrom to arm 99 of`angle lever mounted fixedbracket 100 carried by the base 7. Fixed withthis arm 99, and at anangle thereto, is arm 101 from which eX- tendsl link 102 to arm 103mounted on the fulcrum bearing and lixed withthe lever 69, 71.Accordingly, depressing the pedal 95 places tension on the spring 72 andeffects rocking of the levers 71. 69, to throw the slide member and thusshift the valve control rod 76 back into the valve 75 to allow thedetent 62 to drop into seat 66 on the slide thus connecting thecirculator 55 for operation in curve starting portion 104 (Fig. 4) withthe housing 11 descending at a rapid feed rate as shown by curve portion77 (Fig. 4) in a repetition of this cycle of operation.

Driving belt 1 may be controlled for intermittent or continuous driving,as desired. Herein the circulator is shown as continuously operatingwith the valve determining the direction ot the hydraulic circuits andflow rates as to the cylinder 88. The drive for the main spindle 17 andthe respective auxiliary sprindles 29may be for continuous rotation. Theadjustments of the tools relatively tothe work may be effected throughthe various hand wheels 44, 42, 47, selectively as the wear of the toolor the position .of the work may require. AThe speed reduction wormgearing has such an angle of friction as is effective for automaticallyholding the one side, and that forwardly of the guide.

This means that there is no period when there may he a loose critical orbalanced condition with lost motion which may tend to disturb theaccuracy of work handling. Furthermore, this pulling action is with thepiston rods 90 under tension. This means that a smoothness of travel isinsured at all times because of the avoidance of binding tendencies orvibration along the guide.

The circulator herein disclosed is of the genim; eral type of pump andmechanism shown in Patent No. 1,458,595, Ferris, October 26, 1922. Whatis claimed andit is desired to secure by United States Letters Patent isA machine tool comprising a frame, a verti- 115 cal guideway on theupper portion of said frame, a tool head slidable on said guideway andsupporting tool spindle means in front of said guideway, a Work table atthe base of said frame beneath the tool head, feeding Q0 means for saidtool head com rising a pair ci cylinders at the base of sai frame, oneat each side of said table, pistons in said cylinders and connected tothe tool heady to successively pull the same toward the table and Q5push the same to its' elevated position, said pistons being connected tosaid tool head at points in front of said guideway to neutralize thefeeding stresses on said head, a liuid pump, a valve for changing thedirection and 30 rate of flow from said pump to said cylinders and acontrol devicey for said valve.

ln witness whereof I aiiix `my signature. GEO. E. HALLENBEGK.

